Mantle From
Posted in Garden Antiques on 04/29/2008 03:37 pm by adminEARTH SCIENCE QUESTIONS :what seperates the crust from the mantle?
1.what part of the mantle makes up the asthenosphere
2.what is is made of?
3.how is the contenental crust different from oceanic crust ?
look at the outer mantle and the crust together. Here we make a difference in asthenosphere and lithosphere.
Asthenosphere: The tough liquid part of the outer mantle.
Lithosphere: The stiffer part of the outer mantle and the crust. The lithosphere 'floats' on the asthenosphere, like ice on water.
The oceanic crust of the Earth is different from its continental crust. The oceanic crust is 5 km (3 mi) to 10 km (6 mi) thickand is composed primarily of basalt, diabase, and gabbro. The continental crust is typically from 30 km (20 mi) to 50 km (30 mi) thick, and it is mostly composed of less dense rocks than is the oceanic crust. Some of these less dense rocks, such as granite, are common in the continental crust but rare to absent in the oceanic crust
The crust of the Earth is composed of a great variety of igneous, metamorphic, and sedimentary rocks.
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